Gmail app rich email image carousel preview - how is this done? (Screenshot)

Recieved this email from aliexpress today.
1st ive opened months

This is very new to me, got image previews in gmail list.

Keen to understand how they achieved this.

Src is large with no online preview
Ill try n attach in another post

Aha!

Its always ecommerce, feel out of touch in b2b services

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